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Note 17 - Business Segments (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) MWh	Dec. 31, 2018 USD ($)
Number of Reportable Segments			2
Share-based Payment Arrangement, Expense	$ 590	$ 792	$ 1,236	$ 2,402
Restructuring Charges, Total	0	47	0	450
Corporate, Non-Segment [Member]
Share-based Payment Arrangement, Expense	$ 600	800	$ 1,200	2,400
Restructuring Charges, Total		$ 100		$ 500
Minimum [Member]
Power of Wind Turbines | MWh			2

X

- Definition

Represents the power of wind turbines, expressed in megawatts.

+ References

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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